Rotherham are unlikely to make any more signings before the end of the month, according to manager Steve Evans.
Millwall striker Shaun Batt has joined Leyton Orient on loan.
The 25-year-old has agreed an initial month-long move across south-east London to Brisbane Road.
O's boss Russell Slade moved for Batt as top scorer Kevin Lisbie is sidelined with a hamstring injury, and he could make his debut against Stevenage on Saturday.
Crucially for Slade, Batt is also eligible to play in the Johnstone's Paint Trophy, where Orient are a two-legged tie against Southend away from a trip to Wembley.
Millwall manager Kenny Jackett told his club's official website: "It is a great opportunity for Shaun to get some first-team minutes under his belt.
"He has been used mainly as a substitute so far this season but can hopefully start some games during his time with Orient."